PatchTheCEVCVE-2026-43627: llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() funct
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Routine
HIGH 7.8UPGRADE
CVE-2026-43627 is a high-severity flaw (CVSS 7.8) affecting llama.cpp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundari
Why this priority
- High severity
A fixed release or distro patch exists.
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
ggml llama.cpp UPGRADE
Affected: >= b1283 and <= b9058
Fixed in: newer than b9058
Safe to downgrade to: a release before b1283
1. Check installed version
apt-cache policy llama.cpp || rpm -q llama.cpp || llama.cpp --version
2. UPGRADE to newer than b9058 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade llama.cpp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade llama.cpp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before b1283 (Debian / Ubuntu)
apt-cache madison llama.cpp
sudo apt install llama.cpp=<VERSION_BEFORE_b1283>
sudo apt-mark hold llama.cpp
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list llama.cpp
sudo dnf downgrade llama.cpp-<VERSION_BEFORE_b1283>
sudo dnf versionlock add llama.cpp
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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